The protection of carboxyl groups by esterification has been the most common method in macroscale and microscale chemistries. The esterification is usually conducted under anhydrous conditions; however, in biological chemistry and related fields, the reaction is of major concern in aqueous environments. Immediate esterification of the carboxyl in aqueous alcoholic media driven by an alkyl chloroformate
作者:Jorge Andrés Mora Vargas、Antonio C. B. Burtoloso
DOI:10.1002/cssc.202300936
日期:2023.12.7
A novel and advantageous protocol for accessing carbamates through the known three-component coupling reaction involving carbondioxide, amines, and alkyl halides is described. Employing mild conditions, simple experimental set-up, and immobilized DBU, this protocol addresses several drawbacks from the previous described methods. No classical purification procedures are necessary and the immobilized
CATATLYST COMPONENTS FOR THE POLYMERIZATION OF OLEFINS
申请人:BASELL POLIOLEFINE ITALIA S.R.L.
公开号:US20220332856A1
公开(公告)日:2022-10-20
A solid catalyst component for the polymerization of olefins made from or containing Mg, Ti and an electron donor of formula (I)
where the R
1
and R
5
groups, equal to or different from each other, are selected from C
1
-C
15
hydrocarbon groups, R
2
group is selected from C
2
-C
10
hydrocarbon groups, R
3
to R
4
groups, independently, are selected from hydrogen or C
1
-C
20
hydrocarbon groups, optionally fused together to form one or more cycles, with the proviso that at least one of R
3
to R
4
groups is a C
1
-C
20
alkyl group.